package com.gaga.crm.base.config.shiro;

import com.gaga.crm.pojo.SysRight;
import com.gaga.crm.pojo.SysRole;
import com.gaga.crm.pojo.SysUser;
import com.gaga.crm.service.SysRoleService;
import com.gaga.crm.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class MyShiroRealm extends AuthorizingRealm { //安全数据源

    @Resource
    private UserService userService;

    @Resource
    private SysRoleService roleService;

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    //redis 中数据的 key 的前缀
    private String SHIRO_LOGIN_COUNT = "shiro_login_count_"; //登录计数
    private String SHIRO_IS_LOCK = "shiro_is_lock_"; //锁定用户登录


    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("调用 MyShiroRealm.doGetAuthenticationInfo 获取身份信息！");
        //获得身份信息
        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;
        String usrName = token.getUsername();

        //每次访问，登录次数+1
        ValueOperations<String, String> opsForValue = stringRedisTemplate.opsForValue();
        opsForValue.increment(SHIRO_LOGIN_COUNT + usrName, 1);
        //计数大于 5 时，设置用户被锁定一小时，清空登录计数
        if (Integer.parseInt(opsForValue.get(SHIRO_LOGIN_COUNT + usrName)) > 5) {
            opsForValue.set(SHIRO_IS_LOCK + usrName, "LOCK");
            stringRedisTemplate.expire(SHIRO_IS_LOCK + usrName, 1, TimeUnit.HOURS);
            stringRedisTemplate.delete(SHIRO_LOGIN_COUNT + usrName); //清空登录计数
        }
        if ("LOCK".equals(opsForValue.get(SHIRO_IS_LOCK + usrName))) {
            throw new DisabledAccountException();
        }


        SysUser user = userService.getUserByUsrName(usrName);
        if (user == null) {
            throw new UnknownAccountException(); //账号错误
        }
        if (user.getUsrFlag() == null || user.getUsrFlag().intValue() == 0) {
            throw new LockedAccountException(); //账号锁定
        }
        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(
                user,//身份(根据用户名查询数据库获得的用户)
                user.getUsrPassword(),//凭证(查询数据库获得的密码)
                ByteSource.Util.bytes("gaga"), //加密使用的 salt
                getName()//Realm 对象的名称
        );
        //返回身份信息
        return info;
    }

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("调用 MyShiroRealm.doGetAuthorizationInfo 获取权限信息！ ");
        //获得权限信息
        SysUser user = (SysUser) principalCollection.getPrimaryPrincipal();
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        //暂不授予权限信息，下章再学习授权
        //静态授权：授予主体(用户)相应的角色和权限
        /*info.addRole(user.getRole().getRoleName());
        info.addStringPermission("用户列表");//所有用户拥有"用户列表"权限
        if ("管理员".equals(user.getRole().getRoleName())) {//管理员拥有"增删改"权限
            info.addStringPermission("用户添加");
            info.addStringPermission("用户编辑");
            info.addStringPermission("用户删除");
        }*/

        //动态授权
        //SysRole role = user.getRole();
        SysRole role = roleService.findRoleByUsers(user);
        if (role != null) {
            info.addRole(user.getRole().getRoleName());
            //Set<SysRight> rights = role.getRights();
            List<SysRight> rights = roleService.findRightsByRole(role);
            if (rights != null && rights.size() > 0) {
                for (SysRight right : rights) {
                    info.addStringPermission(right.getRightCode());
                }
            }
        }

        return info;
    }

    //清空当前认证用户权限缓存
    public void clearMyCachedAuthorizationInfo() {
        clearCachedAuthorizationInfo(SecurityUtils.getSubject().getPrincipals());
    }

    //清空所有用户权限缓存
    public void clearAllCachedAuthorizationInfo() {
        if (this.isAuthorizationCachingEnabled()) {//权限缓存是否可用
            Cache<Object, AuthorizationInfo> cache = null;
            CacheManager cacheManager = this.getCacheManager();
            if (cacheManager != null) {
                String cacheName = this.getAuthorizationCacheName(); //获得权限缓存名称
                cache = cacheManager.getCache(cacheName); //获得权限缓存
            }
            if (cache != null) {
                cache.clear(); //清空
            }
        }
    }


}